Edward samtjel



(No Model.)

E. SAMUEL. PROCESS OF MAKING COMPOSITE ARTICLES 0P MANGANESE STEEL AND CAST METAL. V

No. 599,636. Patented Feb. 22 1898.

A Inven/tarp Witnesses Edward *Szzmuez xmi. MW y mmmys UNITED STATES PATENT OFFICE.

EDWARD SAMUEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE WILLIAM WHARTON, JR. & COMPANY, INCORPORATED, OF SAME PLACE.

I PROCESS OF MAKING COMPOSITE ARTICLES OF MANGANESE STEEL AND CAST METAL.

SPEOIFIGATION forming part of Letters Patent No. 599,636, dated February 22, 1898.

Application filed November 3, 1894;. Serial No. 527,808. (No specimens.)

To all whom it may concern:

Be it known that I, EDWARD SAMUEL, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain 5 Improvements in the Process of Hardening and Toughening Objects of Manganese Steel, of which the following is a specification.

The object of my invention is to increase the hardness and toughness of manganesesteel castings, an object which I attain in the manner hereinafter set forth, reference being had to the accompanying drawing, which represents in section the preferred method of carrying my invention into effect.

I have found by experiment that ordinary manganese-steel castings which have been hardened by quenching-that is to say, by dipping them in water while highly heated may be greatly improved both in hardness and in toughness by reheating and gradually cooling the same in a certain manner. While such reheating and gradual cooling may be accomplished in any proper way, an efiective and economical method of accomplishing it is by casting molten iron or other molten metal in contact with the manganese-steel casting, for in this way not only is said casting properly heated, but it can at the same time be united in a composite structure of which the cast metal forms a part. For instance, in the drawing, a represents a manganese-steel casting, and b a mass of cast-iron which has been poured into contact with said steel casting and which is firmly united thereto. The casting may be effected in any suitable mold, such as that shown in section, the letter A indicating the cope, and B the drag, with the partingline at C. By this means the manganese-steel castings can be used in such parts of composite structures as are subjected to the greatest wear, the quality of additional hardness and toughness imparted by this treatment being of especial value in such cases.

Having thus described my invention, I claim and desire to secure by Letters Patent The process herein described of making a composite structure of manganese steel and cast metal, whereby the manganese steel is hardened and toughened, said process consisting in making a cast shape of manganese steel, hardening the said cast shape, then placing it in a mold, and casting molten metal in contact with it, whereby the said shape is reheated, then gradually cooling the composite structure thus formed, to harden and toughen the manganese-steel shape, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD SAMUEL. 

